Composite water reducing agent as well as preparation method and application thereof

The invention relates to a composite water reducing agent as well as a preparation method and application thereof. The composite water reducing agent comprises a polycarboxylic acid water reducing agent, an alcohol amine compound, inorganic salt, inorganic alkali, a dissolution promoter, a surfactant and a stabilizer. The composite water reducing agent provided by the invention has high water reducing rate on the premise of ensuring the working performance of concrete, can improve the activity index, reduces the grinding cost of concrete admixture, and can also reduce the chemical shrinkage performance and self-shrinkage performance of concrete. 本发明涉及一种复合减水剂及其制备方法和应用，所述复合减水剂包括聚羧酸减水剂、醇胺类化合物、无机盐、无机碱、促溶剂、表面活性剂和稳定剂。本发明所述的复合减水剂能保证混凝土工作性能的前提条件下，减水率高，可以提升活性指数，降低混凝土掺合料粉磨成本，还可以减少混凝土的化学收缩性能和自收缩性能。